Automatic control of clock duty cycle

Details Automatic control of clock duty cycle Automatic control of clock duty cycle

2009-06-03

2010-11-23

Donovan, Lincoln (Department: 2816)

Miscellaneous active electrical nonlinear devices, circuits, and

Signal converting, shaping, or generating

Rectangular or pulse waveform width control

C327S147000, C327S156000, C327S172000, C327S176000

Reexamination Certificate

active

07839195

ABSTRACT:
In general, this disclosure is directed to a duty cycle correction (DCC) circuit that adjusts a falling edge of a clock signal to achieve a desired duty cycle. In some examples, the DCC circuit may generate a pulse in response to a falling edge of an input clock signal, delay the pulse based on a control voltage, adjust the falling edge of the input clock signal based on the delayed pulse to produce an output clock signal, and adjust the control voltage based on the difference between a duty cycle of the output clock signal and a desired duty cycle. Since the DCC circuit adjusts the falling edge of the clock cycle to achieve a desired duty cycle, the DCC may be incorporated into existing PLL control loops that adjust the rising edge of a clock signal without interfering with the operation of such PLL control loops.

REFERENCES:
patent: 5907254 (1999-05-01), Chang
patent: 6198322 (2001-03-01), Yoshimura
patent: 6320437 (2001-11-01), Ma
patent: 6320438 (2001-11-01), Arcus
patent: 6456133 (2002-09-01), Nair et al.
patent: 6459314 (2002-10-01), Kim
patent: 6583657 (2003-06-01), Eckhardt et al.
patent: 6593789 (2003-07-01), Atallah et al.
patent: 6670838 (2003-12-01), Cao
patent: 6781419 (2004-08-01), Harrison
patent: 6833743 (2004-12-01), Gu et al.
patent: 6882196 (2005-04-01), Yee et al.
patent: 6940328 (2005-09-01), Lin
patent: 7164304 (2007-01-01), Sekimoto
patent: 7199632 (2007-04-01), Chun et al.
patent: 7298193 (2007-11-01), Agarwal et al.
patent: 7463075 (2008-12-01), White
patent: 2001/0052805 (2001-12-01), Kim
patent: 2003/0151435 (2003-08-01), Ma
patent: 2004/0012428 (2004-01-01), Yee et al.
patent: 2006/0103441 (2006-05-01), Carpenter et al.
patent: 2007/0182470 (2007-08-01), Heyne
patent: 2007/0247234 (2007-10-01), Roper

Affiliated with

Also associated with

Rating

Automatic control of clock duty cycle does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with Automatic control of clock duty cycle, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Automatic control of clock duty cycle will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4238535